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Financing Transactions (Controlled Equity Offering) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 25, 2013
May 23, 2014
Equity Offering [Member]      
Equity Offering [Line Items]      
The maximum value of common stock issuable under the controlled equity offering arrangement   $ 15.0pip_MaximumValueOfStockIssuableUnderStockOffering
/ pip_EquityOfferingAxis
= pip_EquityOfferingMember
 
Commission owed to sales agent, expressed as percentage of aggregate gross proceeds from each sale of shares of common stock   3.00%pip_CommissionOwedToSalesAgentExpressedAsPercentageOfAggregateGrossProceedsFromEachSaleOfShares
/ pip_EquityOfferingAxis
= pip_EquityOfferingMember
 
Amount remaining available under controlled equity offering sale arrangement 3.0pip_RemainingValueOfStockIssuableUnderStockOffering
/ pip_EquityOfferingAxis
= pip_EquityOfferingMember
   
Amendment to the Controlled Equity Offering [Member]      
Equity Offering [Line Items]      
The maximum value of common stock issuable under the controlled equity offering arrangement     $ 15.0pip_MaximumValueOfStockIssuableUnderStockOffering
/ pip_EquityOfferingAxis
= pip_AmendmentToControlledEquityOfferingMember